Ignoring unwanted files
Added sling and slingshot ranged beginner weapons

Atlatl not included. Sling levels up throwing, Slingshot levels archery.
Removed an unneccesary comment and a leftover ammo type
Adjusted slingshot, added ball bearing ammunition

Sling and Slingshot should be completely cleaned up.
Merge PR #761 - add slings and slingshots

Conflicts:
	.gitignore
	game.cpp
	mapitemsdef.cpp